test/SemaCXX/ambiguous-builtin-unary-operator.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++0x
   2
   3 struct A {
   4   operator int&();
   5   operator long*& ();
   6 };
   7
   8 struct B {
   9   operator long&();
  10   operator int*& ();
  11 };
  12
  13 struct C : B, A { };
  14
  15 void test(C c) {
  16   ++c; // expected-error {{use of overloaded operator '++' is ambiguous}}\
  17        // expected-note {{built-in candidate operator++(int &)}} \
  18        // expected-note {{built-in candidate operator++(long &)}} \
  19        // expected-note {{built-in candidate operator++(long *&)}} \
  20        // expected-note {{built-in candidate operator++(int *&)}}
  21 }
  22
  23 struct A1 { operator volatile int&(); };
  24
  25 struct B1 { operator volatile long&(); };
  26
  27 struct C1 : B1, A1 { };
  28
  29 void test(C1 c) {
  30   ++c;  // expected-error {{use of overloaded operator '++' is ambiguous}} \
  31         // expected-note {{built-in candidate operator++(volatile int &)}} \
  32         // expected-note {{built-in candidate operator++(volatile long &)}}
  33 }
  34